Version 2.15 should be installed over 2.0!
2.0 is a must have for 2.15 but you have to choose the apropriate version!
light 2.0 can only update to light 2.15 for example!
the light version only has minor harbour traffic, 8Km atmosphere and fewer graphical changes. events are the same!
btw. next version... might be a 3.0 full... will contain over 40 events (now 20), detailed manual for events, etc. weŽll see
But a long way to go....